A number lock contains 6 digits. How many different zip codes can be made with the digits 0–9 if repetition of the digits is allowed upto 3 digits from the beginning and the first digit is not 0?

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Mr. Dubey

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📊 Discrete Mathematics

Q. A number lock contains 6 digits. How many different zip codes can be made with the digits 0–9 if repetition of the digits is allowed upto 3 digits from the beginning and the first digit is not 0?

(A) 254307
(B) 453600
(C) 458760
(D) 972340

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✅ Correct Answer: (B) 453600

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